* {
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
}
#particles-js {
  position: absolute;
  width: 100vw;
  height: 99vh;
  background-image: url('../img/bg.jpg');
  background-size: 100% 100%;
}
.lihui {
  position: fixed;
  width: 80vw;
  height: 80vw;
  max-width: 700px;
  max-height: 700px;
  right: 0;
  bottom: 0;
  background-size: cover;
  transition: all 2s;
}
.lihui:hover {
  right: -700px;
}
@media screen and (max-width: 767px) {
  #particles-js {
    background-image: url('../img/mbg2.png');
  }
  .lihui {
    right: -20vw;
    transition: all 1s;
  }
  .lihui:hover {
    right: 20vw;
  }
}
